Steam-cock



(No Model.) 4

' A R. MIDDLETON.

` STEAM 000K. l

No. 276,618. 1 Patented May 1,1883.

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g opposite sides thereof, respectively,the tubular "Fig, 2 shows a longitudinal section.

y UNITED l' STATES PATENT OFFICE. v

WILLIAM R. MIDDLETON, OF CLEVELAND, OHIO.

STEAM-COCK.

l sPEcIFIcATIoN forming part of Letters Patent No, 276,618, dated May 1,. 1883. Application filed December 1S, 1882. (No modeLt To all whom it may concern Beit known that I, WILLIAM RMIDDLETON, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and Improved Steam-Gock; and I do hereby declare that the followingis a full, clear, and complete description thereof.

The following is a description ot' the construction and operation ofthe steam-cock above alluded to, reference being had to the annexed drawings for illustration, and making apart of this specication, in which- Figure 1 represents a side view of the cock. Fig. 3 is a detached view of the steam-cock key. Fig. 4 represents the connection of a slide to the hollow head, hereinafter described. Figs.`5 and 6 are detached sections of the steam-,cock described in the following specitication. Fig. 7 is a longitudinal section o t' the cock-cylinder, `taken through the width of the packingstrips, more fully described hereinafter.`

Like letters ot' reference reer to like parts in the severalviews.

The body ot' the cock above alluded to consists ot' a hollow cylinder, A, having on t-wo projections B and O, which have a direct communication with each other through the cylinder, as seen in Fig. 2.

In one end of the cylinderA is closely fitted a plug or key, D, a detached view of which is shown in Fig. 3, in which -it will bc-observed that the end of the plug is hollow and slotted in two ot' its opposite sides, as seen at a, Fig. 3. The plug is represented in the drawings as being straight.l It is preferred, however, to have it slightly tapering, that it may he ground in the cylinder to secure aA steamtight fit.. It will be noticed that the plug is so far inserted in the cylinder as to extendbe- Vyoud the passage-way b, so as to close it when turned in the proper direction for that purpose, and for opening the same by bringing the slots a in openrelation therewith. The outer end of the plug is smaller than the body,

forming a stem, E, which is made steam-tight in its connection with thecylinderby the screwcap F and packing c, resting upon a ring, G, interposed between the said packing and the end of the cylinder to form a solid metal surface for the shoulder d of the plug to turn on, Aand also for another purpose, hereinafter explained. The plug is prevented from passing farther into the cylinder than is shown inthe drawings by a set-screw, e, inserted through the side of the cylinder to an annular groove, f,in which the point of the screw is received,

not to pass farther therein, as afore remarked.

In the opposite end ot' the cylinder is screwed a nut, H, in which is fitted a screw, 1, formed `on the stem J, and hy which the screw is operated bythe hand-wheel K. The stem ofthe screw is made tight-fitting inthe nut H by a screw-cap, L, and packing h, as shown in Fig. 2. Theinnerend of the screw is provided with hollow head, M, in which is loosely tted the stem ot' a slide, N. The connection ofthe stern ot' the slide with the head is by means ot pins i, inserted in the head through to an annular groove in the saidsteni, in which projects the pins, as shown in Fig. 4. By this means the stem is allowed to rotate in the head ot' the ing pulled out the head.

The slide N, above alluded to, consists ot' a center adapted to tit closely but freely inthe hollow ofthe plug I), as seen in Figs. 2 andV 5. Oneach side ot the center projects a wing, a, Fig. 4, adapted toiit closely and slide in the Practically the operation of the above-described steam-cock is as follows: The `cock is inserted in a steam-pipe at any desired place place to which the steam is to he conducted. Tothis end the steam pipe or pipes are screwed into the projections B and G. That steam may be allowed to pass through the cock from C to B, or per contra, the plug D, by means of the handle O, iis turned so as to bring said handle parallel with the steam pipe or projections B and C. This will bring the slots aof the plug facing the steam-passage b, as seen in Fig. 2, in which the slots are shown partly in open relation therewith, allowing a certain amount ot' steam to pass through. It' more steam is needed, the slide N is drawn down farther to the end of the plug by means ofthe screw I. This will bring more or less of the length ot the slot a in open relation with the steam-passage as allowing the plugto turn in the cylinder, butl screw, and is also prevented thereby from be,

slots a ofthe plug, as shown in Figs. 2 and 5. y

between the boiler or steam-generator andthe ICQ the wings and center of the slide are moved more or less down. A full head of steam is let on by drawing the slide wholly frombefor'e the steam passage. To prevent the slide from being drawn entirely out of the plug, the wings ot' the slide will impinge upon the shoulder m,

formed on the inner surface of the cylinder by an enlargement of th'e bore thereof, as seen in Fig. 2. The slide is inserted in the'cylinder by passing the wings n thereof through. the corresponding grooves7 n', Fig. 6, while the center of the slide and the head lVI pass into the cylinder through the smaller part of the bore seen in said figure.

From the above it will be obvious that any amount of steam ranging from a full head to an entire shutoff can be allowed to pass through the cock by means of the slide actuated by the screw I, and can be entirely shut off by screwing the slide into the plug so far as to cover the steam-passage. When the steam is shut ofi' by the slide, as above said, the cock is then made all the more secure from leakage by giving the plug one-quarter of a turn, thereby turning the slotted side away from the steam-pipes, so that the blank sides P of the plug may cover the passage, thereby making the cock secure from leaking. Steam, when thus shut off by the cock, cannot be let on again by moving the slide without first turning the plug so as to bring the slots in open relation to the steam passage or pipes,I

which is done by the handle O, as afore stated. Fig. 2 shows the plug and slide partly in open relation to the steam-pipes, and the position of the plug as shown in Fig. 3 is such as when the cock is closed, andthe steam thereby shut off by a quarter-turn f the plug.

That the cock shall be perfectly free from leaking steam when closed is thel purpose of the packing h', Fig. 7. Said packing consists of two strips of any proper material of sufficient width and length to cover the slots in the end ofv the plug and the steam-passage b. The strips of packing are let into the sides of the bore and ilush therewith, as shown in Fig. 7, which represents a longitudinal section ofthe cylinder euttingthrough the width ofthe packing.

Grooves are made for the packing, respectively, in the side of the bore between the steampassage, so that when the plug or key vD is given the quarter-turn in the cylinder and the steam is cutoff by the slide,as above mentioned, the slots and slide will be covered by the strips of packing, thereby making the cock perfectly y steam-tight when the steam-passage is closed.

To cause the two strips of packing to hug closely to the plug is the other purpose, above alluded to, of the ring Gr, the two inwardprojecting slugs t' of which iit in the grooves holding the packing, thereby compressing and lpipe projections, as described, and strips ot' packing and ring G, substantiallyas and for the purpose set forth.

p 2. In a regulating steam-cock, in combination with the tubular plug,the slide N, provided with wings adapted to tit and move reciprocally in said tubular plugor key by means of the adjusting-screw I, attached to the slide by a swivel-joint connection,substantially as described, and for the purpose set forth.

3. The cylinder A, having side pipe projections, the tubular slotted plug or key D, secured therein by a set-screw, e, packing, and screw-cap F, in combination with the slide N, adjusting screw-nut H, packing, and nut L, constructed and arranged to operate conjontly in the manner substantially, as described, and for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM R. MIDDLE'ION.

' Witnesses:

G. A. WALTER, G. E. Mclsltao. 

